<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0" user-scalable=no>  
    <title>vuekoa</title>
    <script>
        //得到手机屏幕的宽度
        var htmlWidth = document.documentElement.clientWidth || document.body.clientWidth;
        //得到html的Dom元素
        var htmlDom = document.getElementsByTagName('html')[0];
        //设置根元素字体大小
        htmlDom.style.fontSize= htmlWidth/20 + 'px';
    </script>
  </head>
  <body>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>
